@media only screen and (max-width: 1080px), only screen and (max-device-width:1080px) {
    html,body {
        font-size:16.875px;
    }
}
@media only screen and (max-width: 960px), only screen and (max-device-width:960px) {
    html,body {
        font-size:15px;
    }
}
@media only screen and (max-width: 800px), only screen and (max-device-width:800px) {
    html,body {
        font-size:12.5px;
    }
}
@media only screen and (max-width: 720px), only screen and (max-device-width:720px) {
    html,body {
        font-size:11.25px;
    }
}
@media only screen and (max-width: 640px), only screen and (max-device-width:640px) {
    html,body {
        font-size:10px;
    }
}
@media only screen and (max-width: 600px), only screen and (max-device-width:600px) {
    html,body {
        font-size:9.375px;
    }
}
@media only screen and (max-width: 540px), only screen and (max-device-width:540px) {
    html,body {
        font-size:8.4375px;
    }
}
@media only screen and (max-width: 480px), only screen and (max-device-width:480px) {
    html,body {
        font-size:7.5px;
    }
}
@media only screen and (max-width: 414px), only screen and (max-device-width:414px) {
    html,body {
        font-size:6.46875px;
    }
}
@media only screen and (max-width: 400px), only screen and (max-device-width:400px) {
    html,body {
        font-size:6.25px;
    }
}
@media only screen and (max-width: 375px), only screen and (max-device-width:375px) {
    html,body {
        font-size:5.859375px;
    }
}
@media only screen and (max-width: 360px), only screen and (max-device-width:360px) {
    html,body {
        font-size:5.625px;
    }
}
@media only screen and (max-width: 320px), only screen and (max-device-width:320px) {
    html,body {
        font-size:5px;
    }
}
@media only screen and (max-width: 240px), only screen and (max-device-width:240px) {
    html, body {
        font-size: 3.75px;
    }
}
*{
    margin: 0;
    padding:0;
}

.nav-bar{
    text-align: center;
    font-size: 1.6rem;
    line-height:3rem;
    color: #7c7c7c;
    background-color: #e7e7e7;
    display: flex;
    justify-content: space-around;

}
.nav-bar div{
    display: inline-block;
    width: 20vw;
    position: relative;

}
.nav-bar div:nth-child(2){
    width: 40vw;
}
.left-side{
    width:30vw;
    display: inline-block;
    background-color:  #e7e7e7;
    box-sizing: border-box;
    margin: 0;
    border:0;
    overflow-y: scroll;
    border-right: 2px #e7e7e7 solid;
}
.right-side{
    width:30vw;
    display: inline-block;
    background-color:  #e7e7e7;
    box-sizing: border-box;
    margin: 0;
    border:0;
    overflow-y: scroll;


}
.center-side{
    width: 40vw;
    display: inline-block;
    background-color:  #e7e7e7;
    box-sizing: border-box;
    margin: 0;
    border:0;
    overflow-y: scroll;
    border-right: 2px #e7e7e7 solid;


}
.warp{
    display: flex;
    flex-direction: row;
    box-sizing: border-box;


}
.card{
    background-color: #f3f3f3;
    margin-bottom: 5px;
}
.card-title{
    color: red;
    padding: 20px 0;
    width: 85%;
    margin: 0 auto;
}
.card:nth-child(2n) .card-title{
    color: orange;
}
.card:nth-child(3n) .card-title{
    color: deepskyblue;
}
.close{
    float: right;
    /*margin-right: 2rem;*/
}
.card-content{
    width: 85%;
    margin:0 auto;
    padding-bottom: 40px;
}
.card-head{
    width: 85%;
    font-size: 1.5rem;
    margin: 0 auto;
    clear: both;
    line-height: 1.8rem;
    vertical-align: text-bottom;
    padding: 20px 0;

}
.card-btn{
    display: flex;
    flex-direction: row;
    justify-content: space-around;
    margin-top: 20px;
    padding-bottom: 20px;
}
.card-btn img{
    width: 2rem;
    height: 2rem;
}
.card-head span{
    float: right;
    font-size: 1rem;


}
.gray-word{
    color: gray;


}
.options{
    color: gray;
    display: flex;
    flex-direction: row;
    /*justify-content: space-around;*/
    padding-top: 15px;
    flex-wrap: wrap;
}

.options li{
    display: inline-block;
    padding-right: 20px;
}
.options li span{
    color: orange;
    margin-right: 1rem;
}
.big-font{
    font-size: 1.4rem;
    font-weight: bold;
}
.list::-webkit-scrollbar{
    width: 10px;
    background-color: #cccccc;

}
.list::-webkit-scrollbar-thumb{
    background-color: #7c7c7c;
}

.icon{
    width: 4rem;
    height: 4rem;
    position: absolute;
    bottom: -2rem;
    margin-left: 1rem;
    z-index: 0;
}
.mode{
    width: 40vw;
    height: 30vw;
    border:3px solid  #7c7c7c;
    border-radius: 20px;
    position: absolute;
    top:0;
    left: 0;
    right: 0;
    bottom: 0;
    margin:auto;
    background-color: #e7e7e7;
    /*display: none;*/
}
.mode-head{
    text-align: center;
    line-height: 3rem;
    height: 3rem;
    font-size: 2rem;
    color: #7c7c7c;
    padding: 10% 0 3% 0;
}
.mode-content{
    background-color: transparent;
    width: 80%;
    height: 40%;
    margin:3% auto;
    border:0;
    font-size: 1.3rem;
    color: #7c7c7c;
    /*line-height: 1.5rem;*/
    /*text-align: center;*/
    margin-left: 10%;
}
.mode-icon{
    width: 4rem;
    height: 4rem;
    position: absolute;
    left: 0;
    right: 0;
    margin: auto;
    margin-top: -2rem;
}
.mode-btn{
    display: flex;
    flex-direction: row;
    justify-content: space-around;
    /*position: absolute;*/
    /*bottom: 20px;*/
    /*width: 100%;*/
}
.mode-btn img{
    width: 2rem;
    height: 2rem;
}
.mode-state img{
    width: 3rem;
    height: 2.3rem;
    vertical-align: middle;
    margin-right: 1rem;
}
.mode-state{
    margin-top: 8%;
    font-size: 1.5rem;
    text-align: center;
    color: #93d7cf;
    margin-bottom: 1.5rem;
}
.mode-name{
    width: 70%;
    font-size: 1.5rem;
    margin: 0 auto;
    clear: both;
    line-height: 1.8rem;
    vertical-align: text-bottom;
    /*padding: 3% 0;*/
    text-align: center;
}
.mode-name span{

    font-size: 1rem;
    margin-right: 20px;

}

.download-btn,.close,.icon{
    cursor: pointer;
}



/*question-s*/
.options-s{
    justify-content: flex-start;
    font-size: 1.2rem;
}
.options-s img{
    width: 2rem;
    height: 2rem;
    /*float: right;*/
    margin-left: 20%;

}
.options-s input{
    width: 60%;
    font-size: 1.2rem;
}
@media screen and (max-width: 787px){
    body{
        width: 100%;
    }
}
